Question: What sovereign state uses the Australian dollar as currency?
Paraphrase: What imperial state employments the Australian dollar as currency?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P38 wd:Q259502 . ?sbj wdt:P31 wd:Q3624078 } 
Answer: Australia, Tuvalu, Nauru, Kiribati